Learn French: C'est une belle doublure, le client s'en souvient. - It is a beautiful lining, the client remembers it.

When introducing or identifying a noun that is modified by a determiner (like une) and an adjective (like belle), French always uses c'est. You would only use elle est if you were following it with an adjective alone, such as Elle est belle.

Why is the pronoun en used in s'en souvient?

The French verb for 'to remember' is se souvenir de. Because it requires the preposition de, you must use the pronoun en to replace de plus the thing being remembered (in this case, the lining). So il s'en souvient essentially translates to 'he remembers of it'.

Is there a specific rule for why belle comes before the noun doublure?

Yes. While most French adjectives are placed after the noun, short and common adjectives that describe Beauty, Age, Goodness, or Size (often remembered by the acronym BAGS) go before the noun. Since belle relates to beauty, it precedes the noun.

Are there other common meanings for the word doublure?

Yes! While in this context it means the 'lining' of a piece of clothing, in the worlds of theater and film, a doublure is an 'understudy', 'stand-in', or 'stunt double'.